Jig for connecting rods



Aug. 29, 1950 L. E. LAPOINTE ET AL 2,520,249

JIG FOR CONNECTING RODS Filed Jan. 9. 1945 2 Sheets-Sheet 1 Aug. 29, 1950 L. E. LAPOINTE ET AL 0,

JIG FOR CONNECTING oms Filed Jan. 9, 1945 '2 Sheets-Sheet 2 m v O E gmnmkkx I m I 1 Inventors b Mf/ Patented Aug. 29, 1950 JIG- FOR. GQNNEQ'IZING RODS LouisE. Ivapointeand Leandre J. Gaudet; Worcester, Massa, assignors to Elmer H; Brunmark,

Worcester; Mass.

Application January 9, 1945,.Serial;No..5-72,D24.

(c1. ii-62) 2 Claims.

This invention relates to a connecting rod reaming'jig which however can be used'for other operations.

Objects of the: invention. include the provision of a jig primarily for supporting a connecting rod incorrect horizontal position. for a drilling or reaming operation; the provision of a jig for the purpose described having, resilient supports for. positioning a connecting rod or the like; so that the bones in the connecting rod will beexactliy. vertical regardless of irregularities of the extarior surfaces of the connecting rod; and the provisionoi a jig as above stated. comprising a base, a clamping member, resilientsupportsassociated with the clamping member for initially positioning, the larger end of; a. connecting, rod sdthatit's bore will be on a true vertical axis, and. a second spring holder. for the smaller end of. theconnecting rod insuring. correct horizontal-positioning of the connecting rod in the jig.

Further objects of the invention includethe provision of a jig for holding connecting rods comprising a base, an internal clamp for the larger bore of the connecting rod, spring supports at each side of the clamp for initially positioning the connecting rod with its larger bore on a true vertical axis, and a second spring support for the narrow end of the connecting rod, said second spring support having associated therewith a clamping meansfor locking the same in correct position.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which Fig. 1 is a view in side elevation of a jig according to the invention in combination with a tool for operating on the smaller bore of the connecting rod;

Fig. 2 is a plan view of Fig. 1 with the connecting rod removed;

Fig. 3 is a view in elevation with parts in section of the clamping device for the larger bore in the connecting rod;

Fig. 4 is a perspective view of the clamping fingers or wedges;

Fig. 5 is a sectional view through the locating means for the smaller end of the connecting rod.

The present invention as illustrated in the drawings comprises a base or support It upon which may be mounted a bracket l2 for rotatably holding a vertical cutter M. The base III also carries a plate IS in turn supporting the clamping means for a connecting rod l8, the latter having the usual smaller end 20 with bore 22 and larger end 24 with bore 26.

2 An, internal clamping device is utilized to sup:- port the larger end of the connecting rod, this clamp comprising. a base 28 secured to the plate [6 by any desired means such as screws. 30. The: base 281 may be made integral with any upstanding cylindrical element 32 the latter being provided, with a plurality of vertical angular slots 34;. these slots. being arranged in the periphery of the, element 32. Slots 34 are deepest at their upper ends and shallowest at their lower ends as. plainly seen in Fig. 3' and each slot is arrangedi to vertically slid'ably receive a finger or wedge. 36 the. latter having diverging sides, see Fig. 4', in order to provide that a flat surface 38; of each finger or wedge may slide on the bottom of a slot. whilethe surface 418 will extendvertically. Side slots are provided, in each. finger for the reception of screw heads. 44 to provide frictional con.- tact.

At its, upper end the cylindrical member 32' is provided with external screw threads 33 for receiving, a circular ring 38 the latter passing. through slots 58 in each finger both to hold the fingers assembled with the cylindrical member 32 and to adjust the fingers vertically in their slots. It is to be noted that as ring 48 is turned in a direction to travel downwardly relative to element 32, the vertical surfaces 49 of fingers 36 will move outwardly radially with respect to element 32.

At each side of the cylindrical element 32 there is provided an inverted cup or the like 52 which may be secured thereto by any desired means. Each cup 52 has slidable through the top thereof a bolt or the like 54, the latter being provided with a coil spring 56 surrounding the same and bearing upwardly against a head 58. This arrangement provides for a pair of resilient supports 58, one being located at either side of the clamping means 32.

At the other end of the plate [6 there is provided an upstanding bracket 60 which is bifurcated as at 62 to provide a slot open at its top. Bracket 60 may be secured to plate It as by bolts 64 or other desiredmeans. A vertically slidable member 66 is arranged in bracket 60 and is provided with a head 38 acting as a support. A spring it bears against the bottom of the member 66 to normally project the same upwardly for a purpose to be described and a clamp screw 12 is provided to bear upon the member 66 to clamp the same in vertically adjusted position.

Reference characters 14 indicate tapped holes a for adjusting the position of clamping member 32 longitudinally relative to the bracket 66.

In the operation of the device a connecting the ring 48 is turned to radially expand fingers 36 to tightly clamp the larger end of the connecting rod, thus forcing the latter into correct position with the axis of the bore vertically,

and the screw 72 is turned up to hold the support 66 in adjusted position as determined by the weight of the small end of the connecting rod 1 thereon. When this has been done the connecting rod is correctly held in the desired location, and the cutting tool l4 may then be used to provide the operation for which it is intended. The support 10, bracket 12, and tool l4 may be dispensed with where there is provided a drill or the like having a table perfectly square with its spindle, but where the support I6 is used bore 22 of the connecting rod can be machined perfectly parallel to the bore 26.

This invention presents a jig for the purpose described which provides for a practically automatic location of the two bores of the connecting rod in perfectly vertical condition so that both bores of the connecting rod will be parallel for perfect machining.

Having thus described our invention and the advantages thereof, we do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what we claim is:

1. In a device of the class described, a base, an upstanding element and an upstanding bracket on the base in spaced relation, resiliently mounted supporting devices adjacent the element,

a resiliently mounted supporting device in the bracket, means to clamp the bracket supporting device, and radially movable fingers on the element to clamp an object having a hole therein by means of impingement of the fingers on the object hole.

2. In a device of the class described, a base, an upstanding generally cylindrical element on thebase, .a bracket on the base, a plurality of upwardly spring pressed pins adjacent the element to resiliently support an object having a hole, the latter being received over the element,

expansible fingers on the element to fixedly clamp the object, an upwardly spring pressed supporting device on the bracket to resiliently support another part of the same object, and means to clamp the supporting device in fixed relation to .the bracket and base.

The following references are of record in th file of this patent:

UNITED STATES PATENTS Number Name Date 1218.426 Lockley Mar. 6, 1917 1,254,044 Johnson i Jan. 22, 1918 1,499,989 Lehmann July 1, 1924 1,520,623 Weiskofi Dec. 23, 1924 1,522,141 Raby, Jan. 6, 1925 "1,527,361 Jones et al Feb. 24, 1925 1,544,361 Wadell June 30,1925 1,603,070 Cox et a1 Oct. 12, 1926 1,616,052 Kylin Feb. 1, 1927 1,637,508 Aab Aug. 2, 1927 1,697,276 Green Jan. 1, 1929 1,744,095 Auten Jan. 21, 1930 1,744,584 Shoemaker Jan. 21, 1930 1,810,214 Johnson June 16, 1931 2,136,350 Berkman Nov. 8, 1938 2,137,484 Graham Nov. 22, 1938 2,252,121 Fuglie Aug. 12, 1941 

